ixgbe: Add documentation for the driver

Documentation for the ixgbe driver in the kernel docs area is missing.
This adds that documentation.
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/ixgbe.txt

+Linux Base Driver for 10 Gigabit PCI Express Intel(R) Network Connection
+========================================================================
+
+March 10, 2009
+
+
+Contents
+========
+
+- In This Release
+- Identifying Your Adapter
+- Building and Installation
+- Additional Configurations
+- Support
+
+
+
+In This Release
+===============
+
+This file describes the ixgbe Linux Base Driver for the 10 Gigabit PCI
+Express Intel(R) Network Connection.  This driver includes support for
+Itanium(R)2-based systems.
+
+For questions related to hardware requirements, refer to the documentation
+supplied with your 10 Gigabit adapter.  All hardware requirements listed apply
+to use with Linux.
+
+The following features are available in this kernel:
+ - Native VLANs
+ - Channel Bonding (teaming)
+ - SNMP
+ - Generic Receive Offload
+ - Data Center Bridging
+
+Channel Bonding documentation can be found in the Linux kernel source:
+/Documentation/networking/bonding.txt
+
+Ethtool, lspci, and ifconfig can be used to display device and driver
+specific information.
+
+
+Identifying Your Adapter
+========================
+
+This driver supports devices based on the 82598 controller and the 82599
+controller.
+
+For specific information on identifying which adapter you have, please visit:
+
+    http://support.intel.com/support/network/sb/CS-008441.htm
+
+
+Building and Installation
+=========================
+
+select m for "Intel(R) 10GbE PCI Express adapters support" located at:
+      Location:
+        -> Device Drivers
+          -> Network device support (NETDEVICES [=y])
+            -> Ethernet (10000 Mbit) (NETDEV_10000 [=y])
+
+1. make modules & make modules_install
+
+2. Load the module:
+
+# modprobe ixgbe
+
+   The insmod command can be used if the full
+   path to the driver module is specified.  For example:
+
+     insmod /lib/modules/<KERNEL VERSION>/kernel/drivers/net/ixgbe/ixgbe.ko
+
+   With 2.6 based kernels also make sure that older ixgbe drivers are
+   removed from the kernel, before loading the new module:
+
+     rmmod ixgbe; modprobe ixgbe
+
+3. Assign an IP address to the interface by entering the following, where
+   x is the interface number:
+
+     ifconfig ethx <IP_address>
+
+4. Verify that the interface works. Enter the following, where <IP_address>
+   is the IP address for another machine on the same subnet as the interface
+   that is being tested:
+
+     ping  <IP_address>
+
+
+Additional Configurations
+=========================
+
+  Viewing Link Messages
+  ---------------------
+  Link messages will not be displayed to the console if the distribution is
+  restricting system messages. In order to see network driver link messages on
+  your console, set dmesg to eight by entering the following:
+
+       dmesg -n 8
+
+  NOTE: This setting is not saved across reboots.
+
+
+  Jumbo Frames
+  ------------
+  The driver supports Jumbo Frames for all adapters. Jumbo Frames support is
+  enabled by changing the MTU to a value larger than the default of 1500.
+  The maximum value for the MTU is 16110.  Use the ifconfig command to
+  increase the MTU size.  For example:
+
+        ifconfig ethx mtu 9000 up
+
+  The maximum MTU setting for Jumbo Frames is 16110.  This value coincides
+  with the maximum Jumbo Frames size of 16128.
+
+  Generic Receive Offload, aka GRO
+  --------------------------------
+  The driver supports the in-kernel software implementation of GRO.  GRO has
+  shown that by coalescing Rx traffic into larger chunks of data, CPU
+  utilization can be significantly reduced when under large Rx load.  GRO is an
+  evolution of the previously-used LRO interface.  GRO is able to coalesce
+  other protocols besides TCP.  It's also safe to use with configurations that
+  are problematic for LRO, namely bridging and iSCSI.
+
+  GRO is enabled by default in the driver.  Future versions of ethtool will
+  support disabling and re-enabling GRO on the fly.
+
+
+  Data Center Bridging, aka DCB
+  -----------------------------
+
+  DCB is a configuration Quality of Service implementation in hardware.
+  It uses the VLAN priority tag (802.1p) to filter traffic.  That means
+  that there are 8 different priorities that traffic can be filtered into.
+  It also enables priority flow control which can limit or eliminate the
+  number of dropped packets during network stress.  Bandwidth can be
+  allocated to each of these priorities, which is enforced at the hardware
+  level.
+
+  To enable DCB support in ixgbe, you must enable the DCB netlink layer to
+  allow the userspace tools (see below) to communicate with the driver.
+  This can be found in the kernel configuration here:
+
+        -> Networking support
+          -> Networking options
+            -> Data Center Bridging support
+
+  Once this is selected, DCB support must be selected for ixgbe.  This can
+  be found here:
+
+        -> Device Drivers
+          -> Network device support (NETDEVICES [=y])
+            -> Ethernet (10000 Mbit) (NETDEV_10000 [=y])
+              -> Intel(R) 10GbE PCI Express adapters support
+                -> Data Center Bridging (DCB) Support
+
+  After these options are selected, you must rebuild your kernel and your
+  modules.
+
+  In order to use DCB, userspace tools must be downloaded and installed.
+  The dcbd tools can be found at:
+
+        http://e1000.sf.net
+
+
+  Ethtool
+  -------
+  The driver utilizes the ethtool interface for driver configuration and
+  diagnostics, as well as displaying statistical information.  Ethtool
+  version 3.0 or later is required for this functionality.
+
+  The latest release of ethtool can be found from
+  http://sourceforge.net/projects/gkernel.
+
+
+  NAPI
+  ----
+
+  NAPI (Rx polling mode) is supported in the ixgbe driver.  NAPI is enabled
+  by default in the driver.
+
+  See www.cyberus.ca/~hadi/usenix-paper.tgz for more information on NAPI.
+
+
+Support
+=======
+
+For general information, go to the Intel support website at:
+
+    http://support.intel.com
+
+or the Intel Wired Networking project hosted by Sourceforge at:
+
+    http://e1000.sourceforge.net
+
+If an issue is identified with the released source code on the supported
+kernel with a supported adapter, email the specific information related
+to the issue to e1000-devel@lists.sf.net